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All results from a given calculation for SiO2 (silicon dioxide)

using model chemistry: B3LYP/6-31G*

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes D*H 1Σg
Energy calculated at B3LYP/6-31G*
 hartrees
Energy at 0K-439.928113
Energy at 298.15K-439.928259
Nuclear repulsion energy89.142183
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at B3LYP/6-31G*
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 Σg 991 952 0.00      
2 Σu 1450 1392 64.51      
3 Πu 263 252 69.47      
3 Πu 263 252 69.47      

Unscaled Zero Point Vibrational Energy (zpe) 1483.0 cm-1
Scaled (by 0.9603) Zero Point Vibrational Energy (zpe) 1424.1 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at B3LYP/6-31G*
B
0.22818

See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/6-31G*

Point Group is D∞h

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
Si1 0.000 0.000 0.000
O2 0.000 0.000 1.520
O3 0.000 0.000 -1.520

Atom - Atom Distances (Å)
  Si1 O2 O3
Si11.51971.5197
O21.51973.0394
O31.51973.0394

picture of silicon dioxide state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
O2 Si1 O3 180.000
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/6-31G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 Si 0.950 1.124 2.781 1.203
2 O -0.475 -0.562 -1.390 -0.602
3 O -0.475 -0.562 -1.390 -0.602


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 0.000 0.000
CHELPG 0.000 0.000 0.000 0.000
AIM 0.000 0.000 0.000 0.000
ESP 0.000 0.000 0.000 0.000


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -19.749 0.000 0.000
y 0.000 -19.749 0.000
z 0.000 0.000 -31.421
Traceless
 xyz
x 5.836 0.000 0.000
y 0.000 5.836 0.000
z 0.000 0.000 -11.672
Polar
3z2-r2-23.344
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 2.611 0.000 0.000
y 0.000 2.611 0.000
z 0.000 0.000 5.022


<r2> (average value of r2) Å2
<r2> 51.717
(<r2>)1/2 7.191